<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <button onclick="fun()">打开新窗口</button>

    <script>
        function fun(){
            window.open('http://www.baidu.com','我的窗口','width=100px,height=100px,left=300px,top=300px')
        }
    </script>
</body>
</html>